Power Steering Pressure Switch
POWER STEERING PRESSURE SWITCHFig 9 Power Steering Pump Pressure Switch:
A pressure sensing switch is included in the power steering system (mounted on the high-pressure line). This switch will be on vehicles equipped with power steering. The switch (Fig. 9) provides an input to the PCM. This input is provided during periods of high pump load and low engine rpm; such as during parking maneuvers. The PCM will then increase the idle speed through the idle air control(IAC) motor. This is done to prevent the engine from stalling under the increased load.
When steering pump pressure exceeds 1896 kPa +/- 172 kPa (275 +/- 25 psi) the PCM will increase the engine idle speed. This will prevent the engine from stalling.